Chester h



C. H. IHORDARSON'. COIL STRUCTURE FOR'TRANSFORMERS AND THE LIKE.

APPLICATION FILED JAN. 6. I919.

Patented Dec. 30,1919.

A TTORNEY is INVENTOR 6 7 5 @Ef/Zama/ a :adapted to electricaltransformers. Howto that type of transformer illustrated in my.

CHESTER H. THORDARSON, OF CHICAGO, ILLINOIS.

COIL STRUCTURE FOR TRANSFORMERS AND THE LIKE.

Original application filed November 6, 1916, Serial-No. 129,779. Dividedand this application 6, 1919. Serial No. 269,803.

ing in the city of Chicago, county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Coil Structures forTransformers and the like; and I do hereby declare that the following isa clear, full, and exact description thereof, reference being had to theaccompanying drawings and to the reference-numerals marked thereon andwhich form a part of this specification.

This invention relates to improvements in windings for magneticapparatus or devices and the improvements are herein shown. as

ever, the improved windingiherein shown may be used in-Otherpiagnetmmachines or apparatus.

Among the purposes of the invention isgto provide a novel formofwinding'so con structed and arranged as to structurally;

strengthen the winding.

Another object of the invention is to provide an improved constrictingband which surrounds or encircles the winding to hold the turns of thewinding in place, and also,

serves as one end of the winding. or'coil to which is attached a c1rcu1twire.

A further object of the invention is to provide an encircling band ofthis character so constructed as to avoid corona discharge at the edges.of the encircling band and across the coil.

Another object of the invention is to provide means for supporting theinner turns of the conductors forming the winding or coil, constructedwith means to force the supporting member outwardly against the innerturns of the coil. Other objects of the invention are to simplify andimprove windings of the character described, and further to adapt suchwindings to high-tension transformers, and the invention consists in thecombination and arrangement of the parts shownin the drawings anddescribed in the specification, and as pointed out in the appendedclaims.

The present invention is shown as applied prior application for U. S.Letters Patent, Serial No. 129,7 7 9, filed November 6, 1916, of whichthe present application is a division.

As shown in the drawings, Figure'l is a Specification of Letters Patent.Patented Dec. 30, 1919.

filed January side elevation of a transformer embracing a w nding orcoil embodying my invention. Fig. 2 is a section on the.line-2-2 oftice. 14 designates the low tensionwinding ofthe transformer and 15designates as a whole the high tension winding. The core or magneticcircuit and the particular relation of the'high and low] tensionwindings may follow. any

ent invention, the detail construction, how- The high tension coil: 15is of ring-like nated construction followin the usual prac- I vpreferred or well known j practice and constitutes no part of the pres-'80 ever, being embraced and claimed in my said 'co-pending application,Serial No. 129,779.

disk form and is preferably wound with a f plurality of turns ofinsulated flat wire, the

several turns of which are insulated from each other; The said'coil isinsulated from theu mer yoke 10 bvan suitable insulating sleeve 16. Itis'interiorly supported by an open expansible ring17 which is in electrical contact with the inner turn or end' of-the coil,'and said ring isexpanded against the interior of the coil by means of a wedge 18 made ofinsulating material. Said wedge is formed with edge grooves 18, as bestshown in Figs. 5 and 6 which engage the adjacent fend edges of theexpansible ring 17.

Said end edges of the ring and the bottoms of the groove are tapered sothat when the wedge is driven inwardly between the ends I of the bandsupporting ring the ring is ex- 'panded outwardly closely against theinterior of the'coil.

It will be understood that said inner supporting expansible ring iselectrically connected with the inner end or turn o'f=t he coil orwinding.

The said high tension coil 15 is supported I and protected at itsperiphery by a fiat metal band 20, which is formed to almost entirelyencircle the coil and is clamped together at its ends to effect aconfining pressure on the coil. The side edges .of' said band or plates20 are folded inwardly over the marginal portions thereof, andpreferably inclose reinforcing wires 21, the effect of which rolledoveredges is to eliminate corona disinafter be described.

As herein shown, and preferably, the reinforcing wires 21 are made of asingle length of wire bent in general U-shaped formation. one end of theplate extend through openings in a terminal block 22 and are rivetedthereto at 23. At the other end of the band the transverse member 24 ofthe U-shaped reinforcing wire extends transversely across the plate andis engaged by aclamping member 25 which is fixed by screws 26 to theterminal block. The said clamping plate is so-arranged as to efiect aclamping pres sure on the bailor closed portion of the reinforcing wireswhen the said screws 26 are tightened. As herein shown, the clamp? ingplate may assume an angle to the adjacent face of the terminal block 22before the parts are adjusted, and the clamping screws 26, when screwedhome, serves to bring the clamping plate 26 parallel to said adjacentface to eflect the clamping pressure against the closed" or bail-likeportion 24; of the reinforcing wire. The said closed portion of thereinforced wire may be insulated from the clamping plate 25, as by aninsulating member 27, or the clamping plate itself may be made ofinsulating material. One of the terminals 28 of the high tension coil orwinding is mounted on the block 22 andits connection with the outer endof the high tension coil is through the protecting or encircling band20.

The inner end of the high tension coil is connected to a terminal 30,shown in Fig. l, which is mounted on the end of a metal arm 31 whichextends from the inner portion of the coil outwardly to one side thereofin a direction generally parallel to the axis of the coil, and isattached to the inner expansible supporting ring 17 in any suitablemanner. The terminal arm 31 is-extended through the coil to the otherside thereof The free ends of the wire at the same. The terminalsupports for said winding-are also arranged in an exceedingly simpleand. efiicient manner, thereby eliminating high tension cables and hightension insulators at the transformer or other apparatus to which thecoil is applied.

It is to be understood that the invention is capable of considerablevariation within the spirit and scope of the invention and that theforegoing description of the. details showing one embodiment of theinvention is not intended to be limiting, but it is the intent to claimall of inherent novelty shown in the drawings and described in thespecification. v

I claim as my invention,-

1. A ring-like winding, an open expansible ring within and supportingthe inner turns of said winding, and means acting on said ring to expandit outwardly against the winding. 2. A*ring-like winding, an openexpansible ring within and supporting the inner turns of said winding,and provided with oppositely inclined end edgesand a wedge adapted to bedriven between said end edges to expand the ring outwardly.

3. A ring-like winding, an open expansible ring within and supportingthe inner turns-of said winding, and provided with oppositely inclinedend edges and an elongated wedge provided with laterally .and oppositelyopeninggrooves, the bottoms of which are tapered to engage the inclinedendedges of said ring.

4. A ring-like winding, an open fiat coil supporting ring fitting withinthe winding, and means acting against the ends of said ring to expandthe ring outwardly against said winding.

5. A ring-like winding, a terminal conneoted to the outer end of thewinding, and a metal terminal bar extending transversely through saidwinding and electrically connected to the inner end of the winding andprovided at one end with a terminal and turns of said winding andelectrically connected to the inner turns of the winding, means actingon the ring to expand it out- Wardly against the winding, anouterterminal for said winding and a metal bar extending transverselythrough and at both ends beyond the winding and attached to. saidexpansible ring, said bar being provided at one end witha terminal andcurved at its other end toward the outer winding terminal to formbetweenit and said latter terminal a, safety air gap.

7. A ring-like winding, provided with an inner terminal, an open flatmetal protecting ring embracing and clamped on said winding andelectrically connected to "the outer end of thewinding and an outerwind- "ing terminal connected to said ring.

8. A ring-like winding provided with an inner terminal, an open flatmetal protecting ring embraci and clamped on said winding andelectrlcally connected to the outer end of the winding, and an outerwinding terminal connected to said ring, said ring being rounded at itsedges to prevent corona discharge.

r '9. A ring-like winding rovided with in; inner terminal, anopen atmetal protecting ring embracing said winding, reinforcing'wires rolledin the side edges of said inner-terminal, an open fiat metal protectingring -embracing said winding, a single piece .U-shaped wire bent betweenits ends,

with the parallel members rolled in the side edges of the ring,a-terminalblock to which the ends of the said wires are attached, and aclamping member'carried by said block to engage over the 'closed portionof said U- shaped wire. v e

11. A ring-like winding, an open fiat metal protecting ring encirclingsaid winding, with means engagingits ends to clamp it tightly againstthe inclosed winding, the side edges of said ring being curved or"rounded for the purpose set-forth.

' In witness whereof, I claim the foregoing as my invention, I hereuntoappend my signature at Chicago, Illinois, this 3rd day of January 1919HEsTER H. THORDARSON.

